TPU Signal Booster Wrap Around Case Set of Two For Apple iPhone 4 iPhone 4S (All Carriers) - Black/ Red TPU Signal Booster Wrap Around Case will be perfect for your iPhone 4/ 4S. This case alleviates pesky antenna issues of your iPhone 4/ 4S. If you are facing signal problems with your iPhone 4/ 4S this case will do the trick. Precise cutouts for screen, audio port, speakers and charging port with functional buttons covering power and volume. Includes 2 Signal Booster Wrap Case in Red and Black.